Fountain pen



FIG. 1 is a perspective view of a fountain pen showing my new design,

FIG. 2 is a front elevational view thereof,

FIG. 3 is a rear elevational view thereof,

FIG. 4 is a side elevational view thereof,

FIG. 5 is an enlarged scale top plan view thereof; and

FIG. 6 is an enlarged scale bottom plan view thereof. 

The ornamental design for a fountain pen, as shown and described. 